Statistics – Computation
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....9371d&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #9371
Statistics
Computation
Scientific paper
The authors describe a sensor designed to operate onboard a landing module for future mission to Mars. Such sensor is capable to characterize the planetary shallow subsurfaces in terms of complex permittivity. The real and imaginary parts of permittivity are useful to detect, in the terrain, substances with marked polarizability as water in both liquid and solid phases. In addition, the measurement of the electromagnetic parameters of ground are useful to support the data inversion and the computational models of other experiments (e.g. orbiting HF radar, Time Domain Electro-Magnetic sounder, Ground Penetrating Radar). The operating principle of the instrument is based on the mutual impedance measurement of a quadrupole array of electrodes capacitive coupled to the soil (i.e. no galvanic contact is required). Such approach is non-invasive and suitable to be implemented onboard a moving vehicle. The mutual impedance is defined as the ratio of the voltage measured across one pair of electrodes to the current injected from the other pair. The sensor operates in the frequency domain in the band 100Hz - 1MHz. The lower frequency is established to maintain the injected current at a measurable level, whereas the upper limit is choosen as to allow quasi-static approximation of fields. The instrument is structured as a multi-quadrupole system to measure the permittivity at different depths in case of layered soil structures. The authors illustrate the SDSP-ACQUA (Soil Dielectric Spectroscopy Probe - Ares soil Characterization by QUadrupole Analysis): the operating principle, some aspects of the error analysis, preliminary results obtained in laboratory tests and a general data inversion procedure.
del Vento Davide
Storini Marisa
Vannaroni Giuliano
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